SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '996414164b8a7e824c36b9a14a15717417f65839860b4978dd99621644ad39e8' 
  AND token = 'e+yvvfX6Uiw/P+s8qn0zty5Ss82THGGhVPp/mtS9XsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00162

JSON explain

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