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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '170bfc16a2aee38b05a8496afb839ffb39c584a95b142273a6fdc8b0c2990b8e' 
  AND token = 'asV6fM5oB9RzXyPbsMKpohxnSQ0E14yN35FJJN/Wwfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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