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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '043746eae73d27f84642c084ff996d67010591474e5b0f5a36a1117ea41cafd1' 
  AND token = 'vuxlMSv+A1KMbkHwy1s6eSTHzdLwZCs4wJZIPcWE/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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