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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c011cbc345151f703e6782a9f04cdc899597214591e779c008fef5342d7c9f06' 
  AND token = '5SDsO1sj1wgCBGltbQntKy9U9eRpPs8/XBRoDeBHrKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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