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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79e59934fa8bd921d37bee416e106354c2d1244975a2c0c00ef41d8d6b2a16c9' 
  AND token = 'YdmGApykbtfeuZEULRZToEiIIcmRqcm4j9TUtfSGCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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