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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7e07a183a37706486c1fbd376fddff9f3211fc35836d85e3f3a3847c1dd71ab' 
  AND token = 'w9vT135Dkc6cmYLkoIs5KrwyO+fCIRnPhwt6ToTYnes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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