SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe9b6d6911e6ccadae23c38a8d2147190aea3426a09248c7928ff96467b33568' 
  AND token = 'zGtiQ7LQhtBcL1WRO94TBRxY//quBz8oVYWpEPD0/no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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