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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e03a8ef327f983c865d5a2c2cc378c6dabdbb83d5044a6cdc9e9912116974fc' 
  AND token = 'iEyOWeBzOhiD5XedV986iqnNyeV8AiRHX5JX02tbfEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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