SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f147057c917c390fb2834d930f334f0a161560628b2abfba23cbfe0c8d90f27f' 
  AND token = 'wJXBjyVSk40+34XjzdAezf9mLqB8UmD6/51+to/P/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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