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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ed6c7a1e5c078b3d92c5a6ac33cff4e2ad5fa0f4091462dfe102d447c2286e' 
  AND token = 'ehx03ukZJnqTAlFjiNetq/gLoR8Q6OYuM/Acnyh/BT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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