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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c7a8148b0f31caa31971b634a988f72a9bb09c6c2588af2881b6de72166aff8' 
  AND token = '/hINKpnSHeBSgWRRnTMC8kM5HjY69cpob6lkvy7GhhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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