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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92a550c4b9ce3ade4c2089608133f928f8d18f346222e694f20c28cdd9881f5a' 
  AND token = 'j+MOtFGOaVilB9AUYf4WI0lZNPitMEANHTAD1Ly9gNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}