SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c44cf109eff0d24d79dfb46d2bfe5e5d925aa1a1c87e5fa3cc57538f7680e6cc' 
  AND token = 'iiIXZJY/rHSnpzmLspvDaxW0dLhtM94OKyGV09HE3ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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