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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1829cf396e3ce891783f3303520e9050dabd023ffc70bbd4deddc69a851fb37e' 
  AND token = '3oPmFz039zPpQ1l5jK7R8mh8SklMRj6jTOEwQjEiotk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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