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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3202fcb097b71a8ec08bd770332f22eaceb045d1feea8fd19b691a0faf21e652' 
  AND token = 'CQ22AVlGxxhqdjT4hui+tUL5708WKPT7Up4XYa5Ttpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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