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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28b466620a045d1ef3569c2ad28f50fceb21f45aae0bb0ae4483ee06d7bfd9b8' 
  AND token = 'd9kBh0jFCMGSInGC8RtdKKWwFV2IoVdM4WaQ9JtqMAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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