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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcfb7e90e50e9e8c8b4377dfe424ce407c12acdc1d07826097589cfe72254350' 
  AND token = 'JDTrnnojFq+IFjQANJm728S1l8S90WXPLQIAsfQXGxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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