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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdd0e0c595ab8e18bc4fba3444e742c224a57a3833d1b39bafc2ad2839e98939' 
  AND token = 'TvDzKUqIVaiEeVGohQLGyVGc1fYYrgH29ORKUyk9kIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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