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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab4401c4d3a7976ae99b6e1e88958c95a58b83420eec1d5464e4d4d1e17ebd04' 
  AND token = '8Hc2WWrV9AL9Gu9aAdz9E03KLBjyr0S7mN+BW1JrnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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