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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dcef4bed58d78e47235adbc6a32b537f9321a3a5228aa4e8235cde914024819' 
  AND token = 'H5OkTpeJ0MYVCrNBMvwDuOFscqfJ09lXG9c0x7306MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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