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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '237ed299fa09b6c6bc9336b28983f51dff6cdca2fc1996db7a308680e11bda21' 
  AND token = 'i1b5iKh5DN9cZoj43gLnkg1Ft4k7xoq1NLWz6NO5ZUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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