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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63f3646bd4b02be1cde05dc7c906eb1ec187d324449bef610d9cd54c1167edd9' 
  AND token = 'Ot8gqGAUVBKXWI9VLqm3M1E1FgMBbySh6dApt48JWIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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