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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a0c40b7f15aaec010167913f53bdae31477597ebc73fe8789117e25dd99e9bf' 
  AND token = 'twkkZASGtTs0Zs0Eb5ioSyrEalVRSzQVrS9xc13MM5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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