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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea749bdc7a908e1a09879a85f6d635a6e425b1651c1f167065fa9210817dc80f' 
  AND token = 'G5Z7HUokljLY6kIXZ32BzWm9mlQt+Ronavrk5FLxic0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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