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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fac91e73d97882e8e86413105ed584262e2286bdca60e2f96faddba05583c51' 
  AND token = 'cMRNLrHYFhQhN2pAiyNc4p5L7T0EWPmB1fCyqvIiGSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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