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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c72df84f513baf89b817337301e0ca89aad062908c03b7c1476c4c4f713f0226' 
  AND token = 'QZeBBpt9zPKQlqKK33bQX19Q38uXtp1166o1nY8bumE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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