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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a344ce5a0b46ae78bcc33620a63d1d6f81ae2bde4dfd778d249fb8c62591ad89' 
  AND token = 'InkfQMvg2f2v8IfJk0YRd4BB7hsPbbhWSEpxRQB3/sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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