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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03eed301204a5d0ff572527d11e434ffc1313fc9cc5b46c0d1d488700e20a75c' 
  AND token = 'QJ6uEUyR+WUkoxHWfkUSybAycqEhRqHO9KugQjaa8fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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