SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c573114de536099a2d7424774190dd76c67aeb900f863fc6f3e8f073bf1ed3d' 
  AND token = 'oEvetM4Y/a1MRWtD4bDg+w/wk4LKxDhD87uCURPiJzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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