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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be120386b21346cf11058ec3442aa4bfbdae89f62ef13e0d4a3b541571ce3c34' 
  AND token = 'ZDNAMA8K3KNqcfb1PNU7hLkLUTijEoHalchohsvqpjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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