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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca459b5e2e024d8b56914023b69e525e43bb7d130f49b2a84c2ed54d808e994' 
  AND token = 'LPSgTYPOKsQkOa7zcaT2RxnN6dtCzJbz8dU2NEcopeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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