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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceea0c2f8e34060c95ba44bb5ebf88ab89590089e1fbe50cdb2d3a16737f1422' 
  AND token = '5BgV5gHURH6bCeqG56JI/7E9NXViU59T82A33EYZKM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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