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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96eaa46f36e1f9f54eeab4d463a7f865654cbcd0f6572c5c42773966b6e69941' 
  AND token = 'OA5f2yBElr5OrorviFJQD9WJqG4lgVIaaLxRfpkojes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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