SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '832d7e7ef641f04c42f0d6e191327d26dc1ae06f4c136c3972bfe8a779bea504' 
  AND token = 'cDz4ZHVYoEKxwkcTpGUQ3HeYcUL+N+MFsTIcLvxU9TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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