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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '119536505fd92505e7ab6e7e9e3cf696135f7f979c453df17544f28a2c249624' 
  AND token = 'bBp4ofWBdx5QBBhFHRO3yDWs13b6NVJ/rlS3MRzGfvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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