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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2639780af794b560343de15a4573857fef86d7b56cb8cb31b1bcbac6ce03b22a' 
  AND token = 'r2vVs0Mf1WMQbHsHYb3SDeKZbELzAxKOqgyT+MAL1Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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