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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f0fcd5b8fe42ded8454b9f15f9046284fa3f68409669c9b7d183d82a81cf1fd' 
  AND token = 'FLaUgoMjxxNMpHBX7Y1u4XSO8kBpMN3bc+S6VWrJex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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