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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd752e72ffb64b3cca9b6d61aaff8741b7b13c15fcd22d3aa78fac51cc64e76bf' 
  AND token = 'D+nN5olOAn3wGdnXDkH0nPFupnkIyINm60g6EI/3dgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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