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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '123261745207364f2e2697d2c391c8b290e0ad7c575ea5a0d0509191b8b6520d' 
  AND token = 'wypTW/rJbPj/ghFPXwEaisc6NXTR/YamM/xosgHNp48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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