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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae64cca8163cb5119b5707564fbe2f74f728379a7b44174893cd381ed31087b5' 
  AND token = 'C6Ro0a7Jr/DkZJiCFBbhM+bBYE6PFbh+obGiOkfxldI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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