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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c3add2d6893948788f3140a2d852111d52246ba305572b843265d838df2462' 
  AND token = 'Ml617zDhR9RfwnyWUFHyeIn6c62d54E4IINWNfueQvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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