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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbd3b9393a58b9fe8579d351cf001b99d758ca0c24fce5508aa57e0dcf5a4883' 
  AND token = 'sJpcaEBO/r/fF4y2nXRRn43NlKP4E4GJ3vPmRO3ciIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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