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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f57dac7e28348462fbeb466d9b96dee1c717fbcc6d99f75203ed9fa0b3317ea' 
  AND token = 'yDYc93u25q9qzxI22abzJznWbRmrgNNShQvRAJ5ozkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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