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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c15c45fee1055704076406c5093744e96ba2cc3391a98b9a3482962491a338' 
  AND token = 'GrVDTAwcqbrND29ulvpgdUmI5gonvEFyA/lf9hpw7Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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