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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77c7e4b595e2489debecef87f19e26721ae89ca85054ae49e1c65e9225c777fa' 
  AND token = 'QE7UUKRpr7saeGDZIa539MVJ0vkxrs+nm6bosrzDIPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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