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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48401db03bfb7f139d2ce14be47c73c3ac2e5a00562dfd92f94d0947a5b181bd' 
  AND token = 'WTZ5nYFGf1a0RkahcH+u6Pe5P1GLkfJggo07B3I6v7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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