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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be21b4d7236669f61fb3abbd558465e17a6719668286139eb588ce9d3f40ee32' 
  AND token = 'D6dqHicS1OAToETXwvDsmAJWkghHbxWn31LtFnczxlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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