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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc3f1369a4beb26529fa7ebd98c30dcb1c7a1026c95e381ed3019812eb8e0c1d' 
  AND token = 'mT0suuaNsRA11wz1wvZE6Z87WjRPnkcF24BMuElslC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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