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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce5cdeef902ebc6ad3d3d0ebe28b0d97052ec42b6d247aa1d03cafa0a3ef64df' 
  AND token = '4cjy75ftJLUppt3P4OGLjR3QHkE014EBunRhMvh1AYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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