SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b41523a595d9ecb2b1b154de27f157f29bb64f500074dca41fe56676dd749b95' 
  AND token = 'QrjcAQmkmBt082e7xpHFLgoLRWYjlv3NTGBZRKqR9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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