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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce34f3f0cc68d5a874ba0bc373d400ed92734935f5df44d959bdcf443a456e1' 
  AND token = 'eoxUj/XfbNFOwcWFVz3tZGO4hbtd+j9cDoxF3UNF228=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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