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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8864310fdea3f890d3d6408458d2bd7873b6d0af447acfe7c4bc93ad024f2155' 
  AND token = 'uhC7gaMuTVE/dyH6ppx8NRSN6dEaNfo8DdOv4y2S6dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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