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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d9559b72f32f7b76d2b96ccde0b5e073f8b9e79b027f54f5ac19f4d70ce9bb1' 
  AND token = 'CnvRvhsnMZH33I0G747fyRx/yEKsUNR40Yzv82j4dpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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