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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff5fe3923365871c6925d1f909dde2a22cede78a5eb20d5e0cc0aace62f8beda' 
  AND token = 'lJmGSv3roMQflmb7LZRJdPtzfS8yJmHSDgByMo+YAEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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